Animals that use a radula to scrape up algae are _____

a. gastropods
b. bivalves
c. annelids
d. roundworms
e. leeches


ANSWER: a

Biology & Microbiology

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True or False: A biological clock is a set of molecular mechanisms that cycles on its own and thus keeps a regular rhythm

A. true B. false

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____ is NOT a condition of the Hardy-Weinberg concept. 

A. Random mating B. Lack of mutations C. Small population size D. Lack of migration

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Fungi and insects both use the nitrogenous polysaccharide (cellulose/chitin/silica) as a protective molecule in their outer surfaces

What will be an ideal response?

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Cultures taken from an impetigo lesion reveal bacteria that are Gram-positive cocci which are catalase- and coagulase-negative and cause beta-hemolysis when cultured on blood agar. The responsible species is

A) Staphylococcus aureus. B) staphylococci species other than Staphylococcus aureus. C) Streptococcus pyogenes. D) Pseudomonas aeruginosa. E) Clostridium perfringens.

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